Improvement in pulley-blocks



J. MANNING.

Pulley Black.

No. 197,152. Patented Nov. 13,1877.

I Bwwehr: 72%

Winmwrm:

N. PETERS, PHQ

UNITED STATES PATENT OFFICE.

JOSEPH MANNING, OF NEW YORK, N. Y., ASSIGNOR TO RICHARD W.

. MANNING, OF SAME PLACE.

IMPROVEMENT IN PU LLEY-BLOCKS.

I Specification forming part of Letters Patent No. 197,152, datedNovember 13, 1877 application filed September 1, 1877.

To all whom it may concern Be it known that I, JosnPH MANNING, of

' tion of a pulley-block, whereby strength, lightness, and durabilityare secured, and several advantages are obtained, as hereinafterparticularly described and set forth.

In carrying out my invention, the pulleyblock is made of metal,preferably cast-iron, which is afterward made malleable. In form andgeneral outline. it somewhat resembles a vertically-elongated stirrup,and it is provided with a hook for suspending it or attaching it to asupport, the hook being cast in one piece with the block. The upperportion of the stirrup-like block or shackle is arched in such form asto give it the greatest strength and allow ample space for the passageof a knot or other projection or inequality in a rope, and the lowerportion, corresponding with the foot-piece in a stirrup, constitutes abrace for strengthening it. The block or shackle, the suspending-hook,and the brace are all cast in a single piece. The wheel or pulley may bemade of wood, metal, or any other suitable material. It is arranged torevolve around a shaft, the ends of which have their bearings in twoopposite sides of the block or shackle, some distance above the lowerend thereof. The block or shackle may be arranged, to carry two or morewheels or pulleys. When arranged for two, the block is provided with anadditional strengthening-brace, extending longitudinally from the middleof the arched upper portion down to the middle of the trans verse brace,and cast in one piece therewith. This auxiliary brace gives additionalstrength to the block or shackle, and also furnishes an additionalbearing for the shaft around which the two wheels or pulleys revolve.

The accompanying drawings illustrate the manner of carrying out myinvention.

Figure 1 represents a block carrying a single pulley. Fig. 2 representsa block carrying two pulleys.

A represents the stirrup-like block or shackle, B the suspending-hook,and O the transverse brace, all made in a single piece of metal. Theupper portion of the block is arched, as shown, so as to be capable ofsustaining an intense strain, and also to allow the passage of a knot orother protuberance on a rope passing over the wheel or pulley D. Thetransverse brace O, forming the lower end or side of the block orshackle, is slightly curved upward, as shown. The pulley D revolvesaround a shaft, 6, the ends of which have their bearings in the sides ofthe block A, and are secured by upsetting the metal in the usual way. Atthe points where the ends of the shaft 0 rest, the metal of the block Ais thicker than the remaining portions, so as to form enlargements orbosses f on both the inner and outer surfaces of the sides of the block.The outer bosses afi'ord greater facility for hammering down the ends ofthe shaft 6, and the inner bosses receive all the friction of the sidesof the pulley D, while both the inner and the outer bosses increase thestrength of the block at those points without adding materially to itsweight. If the sides of the block or shackle A were not connected by thetransverse brace O, when a severe strainwas brought to bear upon thepulley, the tendency would be to cause the sides of the block to springoutward, and allow the pulley and its shaft to slip out of place; butsuch an accident is rendered impossible by the use of the transversebrace in my invention. By forming the brace C with a slight upwardcurve, as shown in the drawing, the liability of breakage is lessened.

The hook B, as a suspending device, possesses an advantage over a ring,because said hook may be made to engage with a ring as well as with ahook or a nail, while a' ring or eye, as a suspending device, could notbe made to engage with another ring or with a taut rope or a bar.

By the construction herein described I avoid the necessity of providingribs or webs on the surfaces of the block or shackle for the purpose ofstrengthening the metal.

When the block or shackle is intended to carry two pulleys it is made inthe form shown in Fig. 2, in which G represents a bar or strip of metal,cast in one piece with the block A, and extending from the upperportion, under the hook B, down to the transverse brace-G, midwaythereof,thus strengthening the transverse brace, and the entire block orshackle furnishing an additional bearing for the shaft 6, and serving toguide and to keep separate the two ropes passing over the pulleys D D.

I am aware that a patent has been granted for a-pulley and block inwhich the pulley is made of wood, and the block or shackle consists of aforked piece of metal, strengthened by ribs or webs, the pulley-shafthaving its bearings in the ends of the branches of the fork.

The advantage of my invention over the above consists in the superiorstrength obtained by means of the transverse brace without the necessityfor the ribs or webs; and

also in the smalliamcuntv of ifrietion ondngtto the bossesf, as*hereinbefore' described.

In my invention the sides of the block or shackle are smoothed androunded, so as to be of oval form in their cross-section; and by means-I avoid cntting onwearing-of the lower portion, and provided with thebearingbosses f, and the suspending-hook B, all cast in one piece, asherein shown and described, for the purpose set forth.

Witnesses E. It. BROWN,

FH JOHNSON.

